[perl #128341] [JVM] RuntimeException when calling .perl on multidimensional array with some elements autovivified

[Christian Bartolomaeus via RT]

As a follow-up: The following code works as expected:

$ perl6-j -e 'my @a; @a[0;1] = "foo"; @a[0;0] = "bar"; say @a.perl'
[["bar", "foo"],]